Element Management
Transponder for
Prisma® Model 6940/6942/6944 Optical Nodes
Description
This full frequency agile transponder is designed to interface with
Scientific-Atlanta’s Prisma® Model 6940, 6942, and 6944 Optical
Nodes. It is controlled by Scientific-Atlanta’s Transmission
Network Control System (TNCS) software.
The transponder monitors the operational parameters of the node
and allows remote control of certain node functions.
Communications to and from the transponder are accomplished
via the built in forward RF data carrier receiver and reverse RF
data carrier transmitter.
The unit monitors a wide range of operational parameters, including:
• Optical receive power for up to four receivers
• Optical transmit power for up to four transmitters
• RF level of the forward status monitor data carrier
• AC and DC power supply voltages
• Internal station temperature
• Open/closed housing status
If the status of any monitored parameter is outside of established thresholds an alarm can be activated by the
centrally located TNCS console. All alarm thresholds are remotely adjustable from the console. The transponder
also enables remote control of the reverse “On/-6 dB/Off” RF switches (for remote isolation of ingress) and of the
power supply.
The transponder is packaged in an aluminum housing that mounts in the lid of the Model 6940 and 6944 Optical
Nodes. The input, output, and power cables that interface between the transponder and node are easily routed
and plugged into quick connect sockets. No tools are required to mount the transponder. Once installed, LEDs
on the transponder indicate; “Power On”, “Receiving Data”, and / or “Error” condition.
Features
•
•
•
•
•
•
•
“Plug-in” compatibility with the Model 6940, 6942, and 6944 Optical Nodes
Frequency agile 5 to 65 MHz for reverse path
Frequency agile 45 to 174 MHz for forward path
Monitors all critical internal station parameters
Controls all switches within the node
Simple and efficient installation
Wide operating temperature range
Transponder for Prisma Model 6940/6942/6944 Optical Nodes
Specifications
Agile Transmitter
Parameter
Carrier frequency
Frequency step size
Modulation type
Deviation
Occupied bandwidth
RF output level
Output level step size
Level stability
Frequency stability
Spurious and harmonics (5-2000 MHz)
Extinction ratio
Specification
5 - 65
200
FSK
± 67
400
24 to 50
2.0
< ±2.0
± 7.5
> 55
> 60
Units
MHz
kHz
kHz
kHz
dBmV
dB
dB
kHz
dBc
dBc
Specification
45-174
200
–25 to 20
Units
MHz
kHz
dBmV
+30
+40
+50
dBc
dBc
dBc
Notes
Remotely adjustable
Remotely adjustable
Over full temperature and frequency range
Over full temperature and frequency range
From operational output level
Agile Receiver
Parameter
Receive carrier frequency
Frequency step size
RF input level range
Selectivity at frequency offset of:
200 kHz
400 kHz
800 kHz
Notes
Remotely adjustable
Specifies the amount an adjacent carrier’s
level can exceed the transponder receive
carrier’s level at the transponder input,
without causing interference
Monitored Parameters
Device
Optical Receivers (RX ‘s 1- 4)
Optical Transmitters (TX’s 1-4)
Transponder
Node
Power Supply
Power Supply
Power Supply
Parameter
Optical Receive Power
Optical Transmit Power
RF Input Level
Internal Temperature
+ 24 V DC Output Voltage
+ 15 V DC Output Voltage
- 6 V DC Output Voltage
Units
mW / dBm
mW / dBm
dBmV
deg C / deg F
V DC
V DC
V DC
Controllable Parameters
Device
Optical RX 1 & 2 Select Switch
Optical RX 3 & 4 Select Switch
Optical RX 1 & 2 Switch Level
Optical RX 3 & 4 Switch Level
Power Supply Monitor
Primary Optic Restore Time
Control Variables
Primary / Secondary
Primary / Secondary
0-2mW Optical Receive Power
0-2mW Optical Receive Power
Monitor 1 / Monitor 2
0-255 Seconds
Device
Port 3 Reverse Switch
Port 4 Reverse Switch
Port 5 Reverse Switch
Port 6 Reverse Switch
Common Reverse Switch
Control Variables
Normal / -6 dB / Off
Normal / -6 dB / Off
Normal / -6 dB / Off
Normal / -6 dB / Off
Normal / -6 dB / Off
Time primary Optical level must be
present before returning to primary
Environmental Specifications
Parameter
Operating Temperature
Humidity
Specification
-40 to +85
0 to 90
Units
○
C
%
Notes
Non Condensing
2
Transponder for Prisma Model 6940/6942/6944 Optical Nodes
Ordering Information
Description
Transponder for Model 6940/6944 Node - one required per optical node.
6940 SMC Thru Jumper Board - one required per optical node. Has SMB connector to allow forward data
carrier routing to transponder input. Replaces standard thru jumper board on optical interface
board.
Transponder Configuration Cable Kit - one per installation crew. Includes interface cable (connects
transponder to laptop computer), software, and instructions.
Part Number
717600
590955
730169
Related Equipment – TNCS HFC Modem (see HFC Modem data sheet for more information)
Description
TNCS Agile RF Modem. Required for RF communications to/from transponder. Includes Chassis, Power
Supply, Transmitter, HFC Modem, Receiver, & 50 ft DB-9 Extension Cable. Supports up to 4 additional
Receiver/HFC Modem Plug-in Module Sets. Rx: 5.5-31.95 MHz, Tx: 54-88/107-175 MHz
Receiver/HFC Modem Plug-in Module Set.
Note: P/N:738667, RF Modem Expansion Kit also required – one per chassis.
RF Modem Expansion Kit - 5 RF Modem Expansion Cables, Port Expander & Port Expander Input Cable
RF Modem Transmitter Plug-in Module Tx: 54-88/107-175 MHz
RF Modem Receiver Plug-in Module Rx: 5.5-31.95 MHz
HFC Modem Plug-in Module
RF Modem Power Supply Plug-in Module
RF Modem Chassis
RF Modem Blank Panel - Single
RF Modem Blank Panel - Double
RF Modem Air-Flow Unit
Part Number
717615
717616
738667
717617
717618
717619
717620
717621
717622
717623
717624
Related Equipment – TNCS Bundled Computer/Software Packages (see Bundled Packages data sheet for
more information)
Description
TNCS Headend Bundle A: Includes Host Site License, TNCS Server Software, Rackmount Computer,
Rackmount Flip-up Monitor & Keyboard, RS-232 & RS-485 Interface Cards, and RS-485 Cable Kit.
TNCS Headend Bundle B: Includes Host Site License, TNCS Server Software, Rackmount Computer,
17" Monitor, Rackmount Monitor Cabinet, Rackmount Keyboard & mouse, RS-232 & RS-485 Interface
Cards, and RS-485 Cable Kit.
TNCS Headend Bundle C: Includes Host Site License, TNCS Server Software, Desktop Computer,
17" Monitor, RS-232 & RS-485 Interface Cards, RS-485 Cable Kit, and Rackmount Shelves (2).
TNCS Hub Bundle A: Includes Hub Site License, TNCS Server Software, Rackmount Computer,
Rackmount Flip-up Monitor & Keyboard, RS-232 & RS-485 Interface Cards, and RS-485 Cable Kit.
TNCS Hub Bundle B: Includes Hub Site License, TNCS Server Software, Rackmount Computer,
17" Monitor, Rackmount Monitor Cabinet, Rackmount Keyboard & mouse, RS-232 & RS-485 Interface
Cards, and RS-485 Cable Kit.
TNCS Hub Bundle C: Includes Hub Site License, TNCS Server Software, Desktop Computer,
17" Monitor, RS-232 & RS-485 Interface Cards, RS-485 Cable Kit, and Rackmount Shelves (2).
TNCS Single Client Laptop Bundle: Includes TNCS Client software, Laptop Computer, and Installation
Phone Support.
TNCS Single Client Desktop Bundle: Includes TNCS Client software, Desktop Computer, and Installation
Phone Support.
Part Number
735733
735734
592289
735737
735738
592290
717608
717610
Scientific-Atlanta and the Scientific-Atlanta logo are registered trademarks of Scientific-Atlanta, Inc.
ROSA is a trademark of Scientific-Atlanta Europe, NV.
Specifications and product availability are subject to change without notice.
© 2005 Scientific-Atlanta, Inc. All rights reserved.
Scientific-Atlanta, Inc.
1-800-722-2009 or 770-236-6900
www.scientificatlanta.com
Part Number 741621 Rev E
April 2005
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